1. Welcome to 4Runners.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all 4Runner discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other 4Runner owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

What are these hoses??

Discussion in '2nd Gen 4Runners (1990-1995)' started by zocken, Jun 27, 2020.

  1. Jun 27, 2020 at 6:41 AM
    #1
    zocken

    zocken [OP] New Member

    Joined:
    Jun 27, 2020
    Member:
    #15160
    Messages:
    3
    Gender:
    Male
    Vehicle:
    1995 4Runner
    Hey all,

    New to the forums looking for some much-needed help. Can anyone tell me what these two hoses are? No one at the local parts stores has a clue (and neither do I).

    95 4runner 3VZ-Eupload_2020-6-27_9-39-10.jpg
     
  2. Jun 27, 2020 at 8:35 AM
    #2
    Fourtoad

    Fourtoad Gatorgrl's Yotas

    Joined:
    Apr 30, 2019
    Member:
    #9712
    Messages:
    627
    Gender:
    Female
    First Name:
    Gatorgrl
    SWFL
    Vehicle:
    1991 V6 5 speed super clean, Black and grey
    Stock with headers and after market wheels.
    If you have all of your stock stuff in place, then they need to be there. The larger hose goes to the charcoal canister. The smaller hose is the return for the AC idle up system.
     
  3. Jun 27, 2020 at 8:37 AM
    #3
    bthp223

    bthp223 New Member

    Joined:
    Nov 14, 2016
    Member:
    #3009
    Messages:
    361
    Gender:
    Male
    Nevada
    Vehicle:
    1990 4X4
    Are you sure that’s goes to the charcoal canister, I don’t think it does, I’m going to look at my truck now.
    E3A70149-AE06-4965-BA83-8A55719D6E31.jpg 46B6F8BD-75C4-432C-9B3F-73EB223C284D.jpg
    it’s part of the emissions system and goes the the back of the square filter deal, have no idea what it’s called.
     
    Last edited: Jun 27, 2020
  4. Jun 27, 2020 at 8:39 AM
    #4
    Fourtoad

    Fourtoad Gatorgrl's Yotas

    Joined:
    Apr 30, 2019
    Member:
    #9712
    Messages:
    627
    Gender:
    Female
    First Name:
    Gatorgrl
    SWFL
    Vehicle:
    1991 V6 5 speed super clean, Black and grey
    Stock with headers and after market wheels.
    We don't use ours because we eliminated that system so that is blocked off on ours. I am 95% sure it is part of the charcoal canister, but I am going off memory.
     
  5. Jun 27, 2020 at 8:40 AM
    #5
    Fourtoad

    Fourtoad Gatorgrl's Yotas

    Joined:
    Apr 30, 2019
    Member:
    #9712
    Messages:
    627
    Gender:
    Female
    First Name:
    Gatorgrl
    SWFL
    Vehicle:
    1991 V6 5 speed super clean, Black and grey
    Stock with headers and after market wheels.
    BTW, the smaller hose is the other end of your #6 line from your picture on your other thread.
     
    bthp223[QUOTED] likes this.
  6. Jun 27, 2020 at 8:45 AM
    #6
    zocken

    zocken [OP] New Member

    Joined:
    Jun 27, 2020
    Member:
    #15160
    Messages:
    3
    Gender:
    Male
    Vehicle:
    1995 4Runner
    Thanks very much for the replies. I'm trying to order new hoses as the originals are split. I'm having trouble identifying them because I don't know what they are called. Any tips? Thanks!
     
  7. Jun 27, 2020 at 8:47 AM
    #7
    Fourtoad

    Fourtoad Gatorgrl's Yotas

    Joined:
    Apr 30, 2019
    Member:
    #9712
    Messages:
    627
    Gender:
    Female
    First Name:
    Gatorgrl
    SWFL
    Vehicle:
    1991 V6 5 speed super clean, Black and grey
    Stock with headers and after market wheels.
    If you go to Toyota, give them your vin # and they can pull up schematics for your vehicle and you can find the hoses that way.
     
  8. Jun 27, 2020 at 8:48 AM
    #8
    zocken

    zocken [OP] New Member

    Joined:
    Jun 27, 2020
    Member:
    #15160
    Messages:
    3
    Gender:
    Male
    Vehicle:
    1995 4Runner
    I will do that - thanks all!
     
  9. Jun 27, 2020 at 8:49 AM
    #9
    Fourtoad

    Fourtoad Gatorgrl's Yotas

    Joined:
    Apr 30, 2019
    Member:
    #9712
    Messages:
    627
    Gender:
    Female
    First Name:
    Gatorgrl
    SWFL
    Vehicle:
    1991 V6 5 speed super clean, Black and grey
    Stock with headers and after market wheels.
    OK, the big hose is also part of the suck valve that goes to the reed valve on top of the engine. We eliminated ours when we put in headers so I wasn't sure.
     
  10. Jun 27, 2020 at 12:11 PM
    #10
    japhroe

    japhroe New Member

    Joined:
    Oct 15, 2019
    Member:
    #11665
    Messages:
    80
    Gender:
    Male
    First Name:
    Jdiddy
    Vehicle:
    1994 4runner 2WD AT
    ALL STOCK 100%
    Part of the egr system.. very basic description.. they take fresh air from the Air intake and injects it into the exhaust.. thus lowering your pollution output by “dilution” of your exhaust with fresh air..

    google“ 3.0 VZE EGR delete “
     
  11. Jun 30, 2020 at 3:32 PM
    #11
    atgparker

    atgparker Cal Poly, ETME 1988

    Joined:
    Jun 20, 2018
    Member:
    #6296
    Messages:
    328
    Gender:
    Male
    First Name:
    Andrew
    Mission Viejo, CA
    Vehicle:
    1991 White 4Runner 3.0 L
    Rebuilt Engine MLS and ARP on the heads, DT Header, 2-1/2" CARB compliant Flow-Master CAT with 2.0" Bosal CAT back Dayco 1-1/4" Spacers, SkyJacker M-Series Monotube Shocks, Ball Joint Spacers. 95-9006 K&N Air Cleaner, G-Plus Alum Radiator, ZIrgo 16" Fan, Derale Temp switch/relay
    The big one is to get filtered air from the OEM air box to the Air injection valve on the exhaust. The smaller is filtered air to the idle up for when the AC compressor kicks in and the plenum is provided with a controlled vacuum leak which increases the idle speed and thus the power to manage the AC compressors demand on the engine when at a stop light for instance. Those hoses need to be in good shape without any splits in them.
     
    Oldtoyotaguy likes this.
  12. Apr 15, 2021 at 11:53 AM
    #12
    mjamgb

    mjamgb New Member

    Joined:
    Apr 15, 2021
    Member:
    #20955
    Messages:
    27
    Gender:
    Male
    First Name:
    mike
    Vehicle:
    Son's Gen2
    None yet
    The exhaust air injection is not co "dilute" the exhaust. LOL
    No, it is to provide additional oxygen so the Cat can do a complete burn. It also cools the exhaust a little so the NOx emissions are lowered.

    You will note that the smaller hose derives from a part of the intake on the engine side of the air sensor. A leak in this hose will allow unmetered air into the intake and mess up your idle and mixture.
     
  13. Apr 19, 2021 at 8:22 AM
    #13
    watermelonman122

    watermelonman122 New Member

    Joined:
    Jul 4, 2020
    Member:
    #15297
    Messages:
    84
    Utah
    Vehicle:
    1994 4Runner SR5 3.4 V6 4wd 5spd
    The large hose is indeed for an emissions component as others have said. The name given to it by the manual is the "Pulsed Secondary Air Injection (PAIR) System". It's purpose is "To reduce HC and CO emissions, this system draws in air into exhaust ports to accelerate oxidation, using vacuum generated by the exhaust pulsation in the exhaust manifold."

    Here's the section of the manual dealing with that: http://htftp.offroadsz.com/marinhaker/programi/toyota/Engine/3VZ-E/78pulsedse.pdf

    And here's the engine section of the manual for any other hose things you might want to look up: https://www.ether3al.com/93fsm-mobile/engine.html

    upload_2021-4-19_9-20-35.jpg
     
  14. Apr 20, 2021 at 9:21 PM
    #14
    mjamgb

    mjamgb New Member

    Joined:
    Apr 15, 2021
    Member:
    #20955
    Messages:
    27
    Gender:
    Male
    First Name:
    mike
    Vehicle:
    Son's Gen2
    None yet
    Smartypants... um, (thanks).
     

Products Discussed in

To Top